摘要
以桂北融水县贝江河林场杉木人工林为对象,采用野外实地观测与室内浸水法,研究了6种不同密度杉木林枯落物层和土壤层的水文效应。结果表明:(1)6种密度杉木林枯落物的厚度介于3.9~5.7 cm,蓄积量介于4.3~6.4 t/hm^2,枯落物厚度与蓄积量变化一致,从大到小依次为1755,1440,2025,2700,2325,975 plants/hm^2;(2)枯落物最大持水量为2.40~14.23 t/hm^2,最大拦蓄量为5.23~11.51 t/hm^2,有效拦蓄量为2.45~9.49 t/hm^2,且均以1755 t/hm^2最大;(3)在0-100 cm土层内,不同密度杉木林土壤容重介于1.19~1.28 g/cm 3,当林分密度为1755 plants/hm^2时容重最小;(4)6种不同密度杉木林土壤的最大持水量和有效持水量均以1755 plants/hm^2最大,且最大持水量远大于有效持水量;(5)枯落物及其各分解层的持水量与浸水时间呈明显对数关系(R 2>0.96),吸水速率与浸泡时间呈幂函数关系(R 2>0.92)。综上得出,林分密度在1755 plants/hm^2左右时,杉木林能更好地发挥水源涵养功能。
Based on field observation and indoor immersion methods,we examined hydrological effects of litter layer and soil layer of six different densities of Cunninghamia lanceolata plantation in Rongshui Beijianghe Forest Farm of Northern Guangxi.The results showed that:(1)The litter thickness and the stock volume of six densities of Cunninghamia lanceolata plantation ranged from 3.9 to 5.7 cm and from 4.3 to 6.4 t/hm^2,the thickness of litter was consistent with the change of accumulation,and the order from large to small was 1755,1440,2025,2700,2325,975 plants/hm^2;(2)The maximum water holding capacity of litter is 2.40~14.23 t/hm^2,and the maximum storage capacity was 5.23~11.51 t/hm^2.The effective storage capacity was 2.45~9.49 t/hm^2,of which 1755 plants/hm^2 was the largest;(3)In the 0-100 cm soil layer,the soil bulk density of different densities of Cunninghamia lanceolata was between 1.19~1.28 g/cm 3,and the minimum density is 1755 plants/hm^2;(4)The maximum and effective water holding capacity of six different densities of Cunninghamia lanceolat were 1755 plants/hm^2,and the maximum water holding capacity was far greater than the effective water holding capacity;(5)The water holding capacity of litter and its decomposition layers had a logarithmic relationship with soaking time(R 2>0.96),and the water absorption rate had a power function relationship with soaking time(R 2>0.92).In conclusion,the forest with density about 1755 plants/hm^2,Cunninghamia lanceolata forest showed better water conservation ability.
作者
林立文
邓羽松
李佩琦
杨钙仁
蒋代华
黄智刚
雷震
LIN Liwen;DENG Yusong;LI Peiqi;YANG Gairen;JIANG Daihua;HUANG Zhigang;LEI Zhen(College of Forestry Guangxi University,Nanning 530004;College of Agricultural Guangxi University,Nanning 530004;Institute of Environment and Sustainable Development in Agricultural,Chinese Academy of Agricultural Sciences,Beijing 100081;Beijianghe State-owned Forest Farm,Rongshui,Guangxi 545300)
出处
《水土保持学报》
CSCD
北大核心
2020年第5期200-207,215,共9页
Journal of Soil and Water Conservation
基金
广西创新驱动发展专项(桂科AA17204087-8)
国家重点研发计划项目(2017YFC0505402)。
关键词
桂北地区
杉木林
不同密度
水文效应
North Guangxi
Cunninghamia lanceolata forest
different density
hydrological effect
